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Linux 4.13.16
[linux/fpc-iii.git] / net / sunrpc / svcauth_unix.c
blobf81eaa8e08888a1a16041548521a5908bf8a9a50
1 #include <linux/types.h>
2 #include <linux/sched.h>
3 #include <linux/module.h>
4 #include <linux/sunrpc/types.h>
5 #include <linux/sunrpc/xdr.h>
6 #include <linux/sunrpc/svcsock.h>
7 #include <linux/sunrpc/svcauth.h>
8 #include <linux/sunrpc/gss_api.h>
9 #include <linux/sunrpc/addr.h>
10 #include <linux/err.h>
11 #include <linux/seq_file.h>
12 #include <linux/hash.h>
13 #include <linux/string.h>
14 #include <linux/slab.h>
15 #include <net/sock.h>
16 #include <net/ipv6.h>
17 #include <linux/kernel.h>
18 #include <linux/user_namespace.h>
19 #define RPCDBG_FACILITY RPCDBG_AUTH
20
21
22 #include "netns.h"
23
24 /*
25 * AUTHUNIX and AUTHNULL credentials are both handled here.
26 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
27 * are always nobody (-2). i.e. we do the same IP address checks for
28 * AUTHNULL as for AUTHUNIX, and that is done here.
29 */
30
31
32 struct unix_domain {
33 struct auth_domain h;
34 /* other stuff later */
35 };
36
37 extern struct auth_ops svcauth_null;
38 extern struct auth_ops svcauth_unix;
39
40 static void svcauth_unix_domain_release(struct auth_domain *dom)
41 {
42 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
43
44 kfree(dom->name);
45 kfree(ud);
46 }
47
48 struct auth_domain *unix_domain_find(char *name)
49 {
50 struct auth_domain *rv;
51 struct unix_domain *new = NULL;
52
53 rv = auth_domain_lookup(name, NULL);
54 while(1) {
55 if (rv) {
56 if (new && rv != &new->h)
57 svcauth_unix_domain_release(&new->h);
58
59 if (rv->flavour != &svcauth_unix) {
60 auth_domain_put(rv);
61 return NULL;
62 }
63 return rv;
64 }
65
66 new = kmalloc(sizeof(*new), GFP_KERNEL);
67 if (new == NULL)
68 return NULL;
69 kref_init(&new->h.ref);
70 new->h.name = kstrdup(name, GFP_KERNEL);
71 if (new->h.name == NULL) {
72 kfree(new);
73 return NULL;
74 }
75 new->h.flavour = &svcauth_unix;
76 rv = auth_domain_lookup(name, &new->h);
77 }
78 }
79 EXPORT_SYMBOL_GPL(unix_domain_find);
80
81
82 /**************************************************
83 * cache for IP address to unix_domain
84 * as needed by AUTH_UNIX
85 */
86 #define IP_HASHBITS 8
87 #define IP_HASHMAX (1<<IP_HASHBITS)
88
89 struct ip_map {
90 struct cache_head h;
91 char m_class[8]; /* e.g. "nfsd" */
92 struct in6_addr m_addr;
93 struct unix_domain *m_client;
94 };
95
96 static void ip_map_put(struct kref *kref)
97 {
98 struct cache_head *item = container_of(kref, struct cache_head, ref);
99 struct ip_map *im = container_of(item, struct ip_map,h);
100
101 if (test_bit(CACHE_VALID, &item->flags) &&
102 !test_bit(CACHE_NEGATIVE, &item->flags))
103 auth_domain_put(&im->m_client->h);
104 kfree(im);
105 }
106
107 static inline int hash_ip6(const struct in6_addr *ip)
108 {
109 return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
110 }
111 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
112 {
113 struct ip_map *orig = container_of(corig, struct ip_map, h);
114 struct ip_map *new = container_of(cnew, struct ip_map, h);
115 return strcmp(orig->m_class, new->m_class) == 0 &&
116 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
117 }
118 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
119 {
120 struct ip_map *new = container_of(cnew, struct ip_map, h);
121 struct ip_map *item = container_of(citem, struct ip_map, h);
122
123 strcpy(new->m_class, item->m_class);
124 new->m_addr = item->m_addr;
125 }
126 static void update(struct cache_head *cnew, struct cache_head *citem)
127 {
128 struct ip_map *new = container_of(cnew, struct ip_map, h);
129 struct ip_map *item = container_of(citem, struct ip_map, h);
130
131 kref_get(&item->m_client->h.ref);
132 new->m_client = item->m_client;
133 }
134 static struct cache_head *ip_map_alloc(void)
135 {
136 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
137 if (i)
138 return &i->h;
139 else
140 return NULL;
141 }
142
143 static void ip_map_request(struct cache_detail *cd,
144 struct cache_head *h,
145 char **bpp, int *blen)
146 {
147 char text_addr[40];
148 struct ip_map *im = container_of(h, struct ip_map, h);
149
150 if (ipv6_addr_v4mapped(&(im->m_addr))) {
151 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
152 } else {
153 snprintf(text_addr, 40, "%pI6", &im->m_addr);
154 }
155 qword_add(bpp, blen, im->m_class);
156 qword_add(bpp, blen, text_addr);
157 (*bpp)[-1] = '\n';
158 }
159
160 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
161 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
162
163 static int ip_map_parse(struct cache_detail *cd,
164 char *mesg, int mlen)
165 {
166 /* class ipaddress [domainname] */
167 /* should be safe just to use the start of the input buffer
168 * for scratch: */
169 char *buf = mesg;
170 int len;
171 char class[8];
172 union {
173 struct sockaddr sa;
174 struct sockaddr_in s4;
175 struct sockaddr_in6 s6;
176 } address;
177 struct sockaddr_in6 sin6;
178 int err;
179
180 struct ip_map *ipmp;
181 struct auth_domain *dom;
182 time_t expiry;
183
184 if (mesg[mlen-1] != '\n')
185 return -EINVAL;
186 mesg[mlen-1] = 0;
187
188 /* class */
189 len = qword_get(&mesg, class, sizeof(class));
190 if (len <= 0) return -EINVAL;
191
192 /* ip address */
193 len = qword_get(&mesg, buf, mlen);
194 if (len <= 0) return -EINVAL;
195
196 if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
197 return -EINVAL;
198 switch (address.sa.sa_family) {
199 case AF_INET:
200 /* Form a mapped IPv4 address in sin6 */
201 sin6.sin6_family = AF_INET6;
202 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
203 &sin6.sin6_addr);
204 break;
205 #if IS_ENABLED(CONFIG_IPV6)
206 case AF_INET6:
207 memcpy(&sin6, &address.s6, sizeof(sin6));
208 break;
209 #endif
210 default:
211 return -EINVAL;
212 }
213
214 expiry = get_expiry(&mesg);
215 if (expiry ==0)
216 return -EINVAL;
217
218 /* domainname, or empty for NEGATIVE */
219 len = qword_get(&mesg, buf, mlen);
220 if (len < 0) return -EINVAL;
221
222 if (len) {
223 dom = unix_domain_find(buf);
224 if (dom == NULL)
225 return -ENOENT;
226 } else
227 dom = NULL;
228
229 /* IPv6 scope IDs are ignored for now */
230 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
231 if (ipmp) {
232 err = __ip_map_update(cd, ipmp,
233 container_of(dom, struct unix_domain, h),
234 expiry);
235 } else
236 err = -ENOMEM;
237
238 if (dom)
239 auth_domain_put(dom);
240
241 cache_flush();
242 return err;
243 }
244
245 static int ip_map_show(struct seq_file *m,
246 struct cache_detail *cd,
247 struct cache_head *h)
248 {
249 struct ip_map *im;
250 struct in6_addr addr;
251 char *dom = "-no-domain-";
252
253 if (h == NULL) {
254 seq_puts(m, "#class IP domain\n");
255 return 0;
256 }
257 im = container_of(h, struct ip_map, h);
258 /* class addr domain */
259 addr = im->m_addr;
260
261 if (test_bit(CACHE_VALID, &h->flags) &&
262 !test_bit(CACHE_NEGATIVE, &h->flags))
263 dom = im->m_client->h.name;
264
265 if (ipv6_addr_v4mapped(&addr)) {
266 seq_printf(m, "%s %pI4 %s\n",
267 im->m_class, &addr.s6_addr32[3], dom);
268 } else {
269 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
270 }
271 return 0;
272 }
273
274
275 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
276 struct in6_addr *addr)
277 {
278 struct ip_map ip;
279 struct cache_head *ch;
280
281 strcpy(ip.m_class, class);
282 ip.m_addr = *addr;
283 ch = sunrpc_cache_lookup(cd, &ip.h,
284 hash_str(class, IP_HASHBITS) ^
285 hash_ip6(addr));
286
287 if (ch)
288 return container_of(ch, struct ip_map, h);
289 else
290 return NULL;
291 }
292
293 static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
294 struct in6_addr *addr)
295 {
296 struct sunrpc_net *sn;
297
298 sn = net_generic(net, sunrpc_net_id);
299 return __ip_map_lookup(sn->ip_map_cache, class, addr);
300 }
301
302 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
303 struct unix_domain *udom, time_t expiry)
304 {
305 struct ip_map ip;
306 struct cache_head *ch;
307
308 ip.m_client = udom;
309 ip.h.flags = 0;
310 if (!udom)
311 set_bit(CACHE_NEGATIVE, &ip.h.flags);
312 ip.h.expiry_time = expiry;
313 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
314 hash_str(ipm->m_class, IP_HASHBITS) ^
315 hash_ip6(&ipm->m_addr));
316 if (!ch)
317 return -ENOMEM;
318 cache_put(ch, cd);
319 return 0;
320 }
321
322 static inline int ip_map_update(struct net *net, struct ip_map *ipm,
323 struct unix_domain *udom, time_t expiry)
324 {
325 struct sunrpc_net *sn;
326
327 sn = net_generic(net, sunrpc_net_id);
328 return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
329 }
330
331 void svcauth_unix_purge(struct net *net)
332 {
333 struct sunrpc_net *sn;
334
335 sn = net_generic(net, sunrpc_net_id);
336 cache_purge(sn->ip_map_cache);
337 }
338 EXPORT_SYMBOL_GPL(svcauth_unix_purge);
339
340 static inline struct ip_map *
341 ip_map_cached_get(struct svc_xprt *xprt)
342 {
343 struct ip_map *ipm = NULL;
344 struct sunrpc_net *sn;
345
346 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
347 spin_lock(&xprt->xpt_lock);
348 ipm = xprt->xpt_auth_cache;
349 if (ipm != NULL) {
350 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
351 if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
352 /*
353 * The entry has been invalidated since it was
354 * remembered, e.g. by a second mount from the
355 * same IP address.
356 */
357 xprt->xpt_auth_cache = NULL;
358 spin_unlock(&xprt->xpt_lock);
359 cache_put(&ipm->h, sn->ip_map_cache);
360 return NULL;
361 }
362 cache_get(&ipm->h);
363 }
364 spin_unlock(&xprt->xpt_lock);
365 }
366 return ipm;
367 }
368
369 static inline void
370 ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
371 {
372 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
373 spin_lock(&xprt->xpt_lock);
374 if (xprt->xpt_auth_cache == NULL) {
375 /* newly cached, keep the reference */
376 xprt->xpt_auth_cache = ipm;
377 ipm = NULL;
378 }
379 spin_unlock(&xprt->xpt_lock);
380 }
381 if (ipm) {
382 struct sunrpc_net *sn;
383
384 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
385 cache_put(&ipm->h, sn->ip_map_cache);
386 }
387 }
388
389 void
390 svcauth_unix_info_release(struct svc_xprt *xpt)
391 {
392 struct ip_map *ipm;
393
394 ipm = xpt->xpt_auth_cache;
395 if (ipm != NULL) {
396 struct sunrpc_net *sn;
397
398 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
399 cache_put(&ipm->h, sn->ip_map_cache);
400 }
401 }
402
403 /****************************************************************************
404 * auth.unix.gid cache
405 * simple cache to map a UID to a list of GIDs
406 * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS
407 */
408 #define GID_HASHBITS 8
409 #define GID_HASHMAX (1<<GID_HASHBITS)
410
411 struct unix_gid {
412 struct cache_head h;
413 kuid_t uid;
414 struct group_info *gi;
415 };
416
417 static int unix_gid_hash(kuid_t uid)
418 {
419 return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
420 }
421
422 static void unix_gid_put(struct kref *kref)
423 {
424 struct cache_head *item = container_of(kref, struct cache_head, ref);
425 struct unix_gid *ug = container_of(item, struct unix_gid, h);
426 if (test_bit(CACHE_VALID, &item->flags) &&
427 !test_bit(CACHE_NEGATIVE, &item->flags))
428 put_group_info(ug->gi);
429 kfree(ug);
430 }
431
432 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
433 {
434 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
435 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
436 return uid_eq(orig->uid, new->uid);
437 }
438 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
439 {
440 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
441 struct unix_gid *item = container_of(citem, struct unix_gid, h);
442 new->uid = item->uid;
443 }
444 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
445 {
446 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
447 struct unix_gid *item = container_of(citem, struct unix_gid, h);
448
449 get_group_info(item->gi);
450 new->gi = item->gi;
451 }
452 static struct cache_head *unix_gid_alloc(void)
453 {
454 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
455 if (g)
456 return &g->h;
457 else
458 return NULL;
459 }
460
461 static void unix_gid_request(struct cache_detail *cd,
462 struct cache_head *h,
463 char **bpp, int *blen)
464 {
465 char tuid[20];
466 struct unix_gid *ug = container_of(h, struct unix_gid, h);
467
468 snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
469 qword_add(bpp, blen, tuid);
470 (*bpp)[-1] = '\n';
471 }
472
473 static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
474
475 static int unix_gid_parse(struct cache_detail *cd,
476 char *mesg, int mlen)
477 {
478 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
479 int id;
480 kuid_t uid;
481 int gids;
482 int rv;
483 int i;
484 int err;
485 time_t expiry;
486 struct unix_gid ug, *ugp;
487
488 if (mesg[mlen - 1] != '\n')
489 return -EINVAL;
490 mesg[mlen-1] = 0;
491
492 rv = get_int(&mesg, &id);
493 if (rv)
494 return -EINVAL;
495 uid = make_kuid(&init_user_ns, id);
496 ug.uid = uid;
497
498 expiry = get_expiry(&mesg);
499 if (expiry == 0)
500 return -EINVAL;
501
502 rv = get_int(&mesg, &gids);
503 if (rv || gids < 0 || gids > 8192)
504 return -EINVAL;
505
506 ug.gi = groups_alloc(gids);
507 if (!ug.gi)
508 return -ENOMEM;
509
510 for (i = 0 ; i < gids ; i++) {
511 int gid;
512 kgid_t kgid;
513 rv = get_int(&mesg, &gid);
514 err = -EINVAL;
515 if (rv)
516 goto out;
517 kgid = make_kgid(&init_user_ns, gid);
518 if (!gid_valid(kgid))
519 goto out;
520 ug.gi->gid[i] = kgid;
521 }
522
523 ugp = unix_gid_lookup(cd, uid);
524 if (ugp) {
525 struct cache_head *ch;
526 ug.h.flags = 0;
527 ug.h.expiry_time = expiry;
528 ch = sunrpc_cache_update(cd,
529 &ug.h, &ugp->h,
530 unix_gid_hash(uid));
531 if (!ch)
532 err = -ENOMEM;
533 else {
534 err = 0;
535 cache_put(ch, cd);
536 }
537 } else
538 err = -ENOMEM;
539 out:
540 if (ug.gi)
541 put_group_info(ug.gi);
542 return err;
543 }
544
545 static int unix_gid_show(struct seq_file *m,
546 struct cache_detail *cd,
547 struct cache_head *h)
548 {
549 struct user_namespace *user_ns = &init_user_ns;
550 struct unix_gid *ug;
551 int i;
552 int glen;
553
554 if (h == NULL) {
555 seq_puts(m, "#uid cnt: gids...\n");
556 return 0;
557 }
558 ug = container_of(h, struct unix_gid, h);
559 if (test_bit(CACHE_VALID, &h->flags) &&
560 !test_bit(CACHE_NEGATIVE, &h->flags))
561 glen = ug->gi->ngroups;
562 else
563 glen = 0;
564
565 seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
566 for (i = 0; i < glen; i++)
567 seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
568 seq_printf(m, "\n");
569 return 0;
570 }
571
572 static struct cache_detail unix_gid_cache_template = {
573 .owner = THIS_MODULE,
574 .hash_size = GID_HASHMAX,
575 .name = "auth.unix.gid",
576 .cache_put = unix_gid_put,
577 .cache_request = unix_gid_request,
578 .cache_parse = unix_gid_parse,
579 .cache_show = unix_gid_show,
580 .match = unix_gid_match,
581 .init = unix_gid_init,
582 .update = unix_gid_update,
583 .alloc = unix_gid_alloc,
584 };
585
586 int unix_gid_cache_create(struct net *net)
587 {
588 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
589 struct cache_detail *cd;
590 int err;
591
592 cd = cache_create_net(&unix_gid_cache_template, net);
593 if (IS_ERR(cd))
594 return PTR_ERR(cd);
595 err = cache_register_net(cd, net);
596 if (err) {
597 cache_destroy_net(cd, net);
598 return err;
599 }
600 sn->unix_gid_cache = cd;
601 return 0;
602 }
603
604 void unix_gid_cache_destroy(struct net *net)
605 {
606 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
607 struct cache_detail *cd = sn->unix_gid_cache;
608
609 sn->unix_gid_cache = NULL;
610 cache_purge(cd);
611 cache_unregister_net(cd, net);
612 cache_destroy_net(cd, net);
613 }
614
615 static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
616 {
617 struct unix_gid ug;
618 struct cache_head *ch;
619
620 ug.uid = uid;
621 ch = sunrpc_cache_lookup(cd, &ug.h, unix_gid_hash(uid));
622 if (ch)
623 return container_of(ch, struct unix_gid, h);
624 else
625 return NULL;
626 }
627
628 static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
629 {
630 struct unix_gid *ug;
631 struct group_info *gi;
632 int ret;
633 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
634 sunrpc_net_id);
635
636 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
637 if (!ug)
638 return ERR_PTR(-EAGAIN);
639 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
640 switch (ret) {
641 case -ENOENT:
642 return ERR_PTR(-ENOENT);
643 case -ETIMEDOUT:
644 return ERR_PTR(-ESHUTDOWN);
645 case 0:
646 gi = get_group_info(ug->gi);
647 cache_put(&ug->h, sn->unix_gid_cache);
648 return gi;
649 default:
650 return ERR_PTR(-EAGAIN);
651 }
652 }
653
654 int
655 svcauth_unix_set_client(struct svc_rqst *rqstp)
656 {
657 struct sockaddr_in *sin;
658 struct sockaddr_in6 *sin6, sin6_storage;
659 struct ip_map *ipm;
660 struct group_info *gi;
661 struct svc_cred *cred = &rqstp->rq_cred;
662 struct svc_xprt *xprt = rqstp->rq_xprt;
663 struct net *net = xprt->xpt_net;
664 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
665
666 switch (rqstp->rq_addr.ss_family) {
667 case AF_INET:
668 sin = svc_addr_in(rqstp);
669 sin6 = &sin6_storage;
670 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
671 break;
672 case AF_INET6:
673 sin6 = svc_addr_in6(rqstp);
674 break;
675 default:
676 BUG();
677 }
678
679 rqstp->rq_client = NULL;
680 if (rqstp->rq_proc == 0)
681 return SVC_OK;
682
683 ipm = ip_map_cached_get(xprt);
684 if (ipm == NULL)
685 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
686 &sin6->sin6_addr);
687
688 if (ipm == NULL)
689 return SVC_DENIED;
690
691 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
692 default:
693 BUG();
694 case -ETIMEDOUT:
695 return SVC_CLOSE;
696 case -EAGAIN:
697 return SVC_DROP;
698 case -ENOENT:
699 return SVC_DENIED;
700 case 0:
701 rqstp->rq_client = &ipm->m_client->h;
702 kref_get(&rqstp->rq_client->ref);
703 ip_map_cached_put(xprt, ipm);
704 break;
705 }
706
707 gi = unix_gid_find(cred->cr_uid, rqstp);
708 switch (PTR_ERR(gi)) {
709 case -EAGAIN:
710 return SVC_DROP;
711 case -ESHUTDOWN:
712 return SVC_CLOSE;
713 case -ENOENT:
714 break;
715 default:
716 put_group_info(cred->cr_group_info);
717 cred->cr_group_info = gi;
718 }
719 return SVC_OK;
720 }
721
722 EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
723
724 static int
725 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
726 {
727 struct kvec *argv = &rqstp->rq_arg.head[0];
728 struct kvec *resv = &rqstp->rq_res.head[0];
729 struct svc_cred *cred = &rqstp->rq_cred;
730
731 if (argv->iov_len < 3*4)
732 return SVC_GARBAGE;
733
734 if (svc_getu32(argv) != 0) {
735 dprintk("svc: bad null cred\n");
736 *authp = rpc_autherr_badcred;
737 return SVC_DENIED;
738 }
739 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
740 dprintk("svc: bad null verf\n");
741 *authp = rpc_autherr_badverf;
742 return SVC_DENIED;
743 }
744
745 /* Signal that mapping to nobody uid/gid is required */
746 cred->cr_uid = INVALID_UID;
747 cred->cr_gid = INVALID_GID;
748 cred->cr_group_info = groups_alloc(0);
749 if (cred->cr_group_info == NULL)
750 return SVC_CLOSE; /* kmalloc failure - client must retry */
751
752 /* Put NULL verifier */
753 svc_putnl(resv, RPC_AUTH_NULL);
754 svc_putnl(resv, 0);
755
756 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
757 return SVC_OK;
758 }
759
760 static int
761 svcauth_null_release(struct svc_rqst *rqstp)
762 {
763 if (rqstp->rq_client)
764 auth_domain_put(rqstp->rq_client);
765 rqstp->rq_client = NULL;
766 if (rqstp->rq_cred.cr_group_info)
767 put_group_info(rqstp->rq_cred.cr_group_info);
768 rqstp->rq_cred.cr_group_info = NULL;
769
770 return 0; /* don't drop */
771 }
772
773
774 struct auth_ops svcauth_null = {
775 .name = "null",
776 .owner = THIS_MODULE,
777 .flavour = RPC_AUTH_NULL,
778 .accept = svcauth_null_accept,
779 .release = svcauth_null_release,
780 .set_client = svcauth_unix_set_client,
781 };
782
783
784 static int
785 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
786 {
787 struct kvec *argv = &rqstp->rq_arg.head[0];
788 struct kvec *resv = &rqstp->rq_res.head[0];
789 struct svc_cred *cred = &rqstp->rq_cred;
790 u32 slen, i;
791 int len = argv->iov_len;
792
793 if ((len -= 3*4) < 0)
794 return SVC_GARBAGE;
795
796 svc_getu32(argv); /* length */
797 svc_getu32(argv); /* time stamp */
798 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
799 if (slen > 64 || (len -= (slen + 3)*4) < 0)
800 goto badcred;
801 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
802 argv->iov_len -= slen*4;
803 /*
804 * Note: we skip uid_valid()/gid_valid() checks here for
805 * backwards compatibility with clients that use -1 id's.
806 * Instead, -1 uid or gid is later mapped to the
807 * (export-specific) anonymous id by nfsd_setuser.
808 * Supplementary gid's will be left alone.
809 */
810 cred->cr_uid = make_kuid(&init_user_ns, svc_getnl(argv)); /* uid */
811 cred->cr_gid = make_kgid(&init_user_ns, svc_getnl(argv)); /* gid */
812 slen = svc_getnl(argv); /* gids length */
813 if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
814 goto badcred;
815 cred->cr_group_info = groups_alloc(slen);
816 if (cred->cr_group_info == NULL)
817 return SVC_CLOSE;
818 for (i = 0; i < slen; i++) {
819 kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
820 cred->cr_group_info->gid[i] = kgid;
821 }
822 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
823 *authp = rpc_autherr_badverf;
824 return SVC_DENIED;
825 }
826
827 /* Put NULL verifier */
828 svc_putnl(resv, RPC_AUTH_NULL);
829 svc_putnl(resv, 0);
830
831 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
832 return SVC_OK;
833
834 badcred:
835 *authp = rpc_autherr_badcred;
836 return SVC_DENIED;
837 }
838
839 static int
840 svcauth_unix_release(struct svc_rqst *rqstp)
841 {
842 /* Verifier (such as it is) is already in place.
843 */
844 if (rqstp->rq_client)
845 auth_domain_put(rqstp->rq_client);
846 rqstp->rq_client = NULL;
847 if (rqstp->rq_cred.cr_group_info)
848 put_group_info(rqstp->rq_cred.cr_group_info);
849 rqstp->rq_cred.cr_group_info = NULL;
850
851 return 0;
852 }
853
854
855 struct auth_ops svcauth_unix = {
856 .name = "unix",
857 .owner = THIS_MODULE,
858 .flavour = RPC_AUTH_UNIX,
859 .accept = svcauth_unix_accept,
860 .release = svcauth_unix_release,
861 .domain_release = svcauth_unix_domain_release,
862 .set_client = svcauth_unix_set_client,
863 };
864
865 static struct cache_detail ip_map_cache_template = {
866 .owner = THIS_MODULE,
867 .hash_size = IP_HASHMAX,
868 .name = "auth.unix.ip",
869 .cache_put = ip_map_put,
870 .cache_request = ip_map_request,
871 .cache_parse = ip_map_parse,
872 .cache_show = ip_map_show,
873 .match = ip_map_match,
874 .init = ip_map_init,
875 .update = update,
876 .alloc = ip_map_alloc,
877 };
878
879 int ip_map_cache_create(struct net *net)
880 {
881 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
882 struct cache_detail *cd;
883 int err;
884
885 cd = cache_create_net(&ip_map_cache_template, net);
886 if (IS_ERR(cd))
887 return PTR_ERR(cd);
888 err = cache_register_net(cd, net);
889 if (err) {
890 cache_destroy_net(cd, net);
891 return err;
892 }
893 sn->ip_map_cache = cd;
894 return 0;
895 }
896
897 void ip_map_cache_destroy(struct net *net)
898 {
899 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
900 struct cache_detail *cd = sn->ip_map_cache;
901
902 sn->ip_map_cache = NULL;
903 cache_purge(cd);
904 cache_unregister_net(cd, net);
905 cache_destroy_net(cd, net);
906 }
Linux with added FPC-III support